DEC Special Graphics

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DEC Special Graphics
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Alias(es)IBM-1090
Based onASCII

DEC Special Graphics

boxes on the VT100 video terminal and the many emulators, and used by bulletin board software. The designation escape sequence ESC ( 0 (hexadecimal 1B 28 30) switched the codes for lower-case ASCII letters to draw this set, and the sequence ESC ( B (hexadecimal 1B 28 42) switched back.[2] IBM calls it Code page 1090.[3]

Character set

DEC Special[1][3]
0 1 2 3 4 5 6 7 8 9 A B C D E F
5x
NBSP
6x
[a]
°
±
7x
[b]
π
£
·
  Same as ASCII (not shown)

See also

Footnotes

  1. ^ In IBM's system of character IDs, this is SV240000,[3] not the SF150000 which is mapped to U+2592 in other code pages such as code page 437.[4] The reference glyph for SV240000 differs in showing a chequerboard pattern[3] rather than SF150000's dithered shade.[4] U+1FB95 🮕 , in the much more recently added Symbols for Legacy Computing block, is explicitly a chequerboard shade.[5] In the specification for IBM Japanese Host code, SV240080 (i.e. SV240000 with the fullwidth attribute set) is mapped to U+25A6 ; however, the reference glyph given there for SV240080 differs from that of SV240000.[6]
  2. ^ The Unicode code chart for the range U+23BA through U+23BD (the scan lines before and after this character) explicitly notes that "scan line-5 is unified with the box-drawing graphic character 2500".[7]

References

  1. ^ a b Digital (1984). "Table 2-4: DEC Special Graphics Character Set". VT220 Programmer Reference Manual (2nd ed.).
  2. ^ Mascheck, Sven; Le Breton, Stefan; Hamilton, Richard L. "About the 'alternate linedrawing character set'". ~sven_mascheck/.
  3. ^ a b c d IBM. Code Page 01090 (PDF). Archived from the original (PDF) on 2015-07-08. Retrieved 2020-01-08.
  4. ^ a b IBM. Code Page 00437 (PDF). Archived from the original (PDF) on 2015-07-08.
  5. ^ "Symbols for Legacy Computing" (PDF). Unicode Consortium.
  6. ^ "IBM Japanese Graphic Character Set, Kanji: DBCS–Host and DBCS-PC" (PDF). IBM. 2002. C-H 3-3220-024 2002-11. Archived from the original (PDF) on 2020-06-02. Retrieved 2021-10-29.
  7. ^ "Miscellaneous Technical" (PDF). Unicode Consortium.

External links